"While some outsized Pacific [walrus] males can weigh as much as 2,000 kg (4,400 lb), most weigh between 800 and 1,700 kg (1,800 and 3,700 lb)."Also:"Most manatees weigh about 900-1200 pounds (410-545 kg). The largest females may weigh up to 3910 pounds (1,775 kg)."